Improvement in millstone-bushes



J. F. McKRAY.

Millstone Bush.

Patented June 23, 1863.

Nirnn STATES v rines.

Aram

J. F. MGKRAY, OF HARIWIONSBURG, PENNSYLVANIA.

Specification forming part of Letters Patent No. 35,9 l, dated June 23,1863.

To all whom it may concern:

Be it known that I, J. F. MGKRAY, of Ilarmonsburg, in the county ofCrawford and State l of Pennsylvania, have inventeda new and ImprovedMillstone-Bush; and I do hereby declare that the following is a full,clear, and exact description of the same, reference being had to theaccompanying drawings, forming a part of this specification, in which-Figure l represents a side elevation of my invention. Fig. 2 isavertical central section of the same. Fig. 3 is a horizontal section ofthe same, the line x fr, Fig. l, indicating the plane of section. Fig. 4is a similar section of the same, taken in the plane indicated by theline y y, Fig. 1. Fig. 5 is a modification of my invention as applied toa horizontal shaft. Fig. 6 is a transverse vertical section of the same.

Similar letters of reference in the several views indicate correspondingparts. A

The object-of this invention is to obtain a durable bush for the spindleof the bed-stone, one that will admit of a certain degree ofadjustability, so as to conform in itself to the position of thespindle, one that will also insure a perfect lubrication of the spindle,and also protect the spindle from foreign substances that mightotherwise work betweenA the collar and caps and produce unnecessaryfriction and wear.

My bush A is made of a cylindrical box, u, provided with projections orribs, b, to afford a firm hold lo the stone. It is provided with afollower, B, fastened to it from below by means of screws c.

C is the spindle, the collar d of which is bturned off to a true taper,and a cap, D, of copper, or other suitable material, is fitted on thetop of the spindle, being provided with a hole to fit the top orsmallest part of the collar. This cap is designed to remain stationary,with the exception of the up-and-down motion produced by the movement ofthe spindle in raising and lowering the runner in grinding. In the sidesof this meta-l cap are two notches or slots, e', cut to t onto pins e,projecting from the circumference of the main cap of the bush. Thesenotches are cut at av slight angle to suit a stone running from left toright, or with the sun, and prevent the cap from rotating withoutinterfering with its upand-down motion. The use of this copper cap is toprevent as far-as possible any dirt, grit, or grain from entering thebush and packing around the collar of the spindle. That portion of thecollar of the spindle above the bush being turned tapering will keep thehole in the copper cap worn so as to perfectly fit the collar until itis worn to` the full size of the collar, when a new cap will have to besupplied.

E is the main cap, the top of which is provided with a tapering recess,f, for the reception of tallow, and inside of the cap is placed a diskor partition, g, for the purpose'of keeping the packing and tallowapart. An annular lip, h, on the inner surface of the cap, presses downon the center of the partitionplate, g, giving to it a dishing form, forthe I purpose of conducting the tallow as it melts to the spindle. Thecap E is retained in its place by notches h in its sides, which catch onpins h', projecting from the main part of the bush. Next below the cap Eon the outside of the bush are three rings, t' j la, the two upper onesbeing put on loose, with the eX- ception of ablind fastening.(Indicatedin Fig. 2 of lthe drawings.) The lower ring of the three is tobe cast solid with the bush, and is to be bedded into the stone anydesired'depth below its face. The upper ring or collar, t, and thesecond ring or washer, j, are intended to ll up the space between thering or rim k and the face of the' stone, and as the face of the stonewears down the washer can be taken out and the collar flet down. The riml at the lower end of the bush is designed to strengthen the bush and tokeep the plaster to its place when the bush is cemented into the eye ofthe stone. The inside of the bush. is provided with a liningof tin orother suitable material, put in tight and snug, but its edges are notsoldered together, to give it a chance toA expand and tighten from thepressure of the packing. Secured to the inside of this lining are thetapering oil-cups m, running down to points nearly close to thefollower, and placed so as to mismatch the tapering lugs a, projectingup from the follower. The oil-cups m serve the double purpose-first, tocontain the oil, and, second, to

contract the space in which the packing isv contained as the distancerecedes from the point of pressure. By these means thepressure on thepacking is rendered uniform from one end of the bush to the other, andthe tapering lugs n, projecting up from the follower, have the effect ofcrowding the packing to the journal as the screws are tightened up.

The paekingwhich use consists of ground corn-@obs and the raspings ofBabbitt metal, together with metallic bars made of Babbitt or any othermetal suitable for the bearings of mill-journals. This packing may alsobe used with advantage in a bush with two followers, o-sueh asrepresented in Figs. 5 and 6-and this bush may either be used for ahorizontal or for a vertical shaft, and the oil may be admitted througha cap, p, and a small hole, which can be opened or stopped up by a pinwith a tapering` point.

What I claim as new, and desire to secure by Letters Patent, is

l. The application of the cap D, with oblique notches e, in combinationwith the tapering collar d of the spindle and with the main cap E ofthebush, constructed and operating in the manner and for the purposesubstantially as specified. p

2. The partition-plate g,in combination with the annular lip h,projecting from the inner surface of the cap E, as and for the purposeshown and described.

3. lhe tapering oil-cups m in the interior of the bush A, in combinationwith the packing and with the follower B, constructed and operatingsubstantially as and for the purpose set forth.

J. F. MCKRAY. v

Witnesses:

H. L. RICHMOND, A. CLARK.

